The Tsushima Straits Story The Silent Service : Season 1 Episode 35

Mines (9 Sub Wolf Pack) At the urging of Vice Admiral Charles A. Lockwood, civilian scientists developed an electronic device that enabled submarines to detect floating and submerged mines. With this apparatus, a wolf-pack of nine subs entered the Sea of Japan in June 1945 and wreaked havoc with enemy shipping, contributing materially to the end of the war.